David Arthur created KAFKA-14668:
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Summary: NoOpRecord causes unnecessary UMR in migration mode
Key: KAFKA-14668
URL: https://issues.apache.org/jira/browse/KAFKA-14668
Project: Kafka
Issue Type: Bug
Reporter: David Arthur
While the KRaftMigrationDriver is in "dual write" mode, in addition to
propagating metadata back to ZooKeeper, it is sending controller RPCs to ZK
brokers. When a NoOpRecord is written, it will trigger the metadata
synchronization logic and send out redundant UMR even if no metadata has
changed. This doesn't affect correctness of the metadata in the cluster, but
will have a significant impact on performance for larger clusters.
We need to avoid sending RPCs to the ZK brokers when nothing has changed.
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